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Wrote in posix shell for performance and compatibility #12

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46 changes: 16 additions & 30 deletions build.sh
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Original file line number Diff line number Diff line change
@@ -1,45 +1,31 @@
#!/bin/bash -e
# Tiny Linux Bootloader
# (c) 2014- Dr Gareth Owen (www.ghowen.me). All rights reserved.

# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#!/bin/sh -e

INPUT="bsect.asm"
OUTPUT="disk"
KERN="./barebones"
KERN="./barebone"
RD="./big.init"

#size of kern + ramdisk
K_SZ=`stat -c %s $KERN`
R_SZ=`stat -c %s $RD`
K_SZ=$(stat -c %s $KERN)
R_SZ=$(stat -c %s $RD)

#padding to make it up to a sector
K_PAD=$((512 - $K_SZ % 512))
R_PAD=$((512 - $R_SZ % 512))
K_PAD=$((512 - K_SZ % 512))
R_PAD=$((512 - R_SZ % 512))

nasm -o $OUTPUT -D initRdSizeDef=$R_SZ $INPUT
nasm -o $OUTPUT -D initRdSizeDef="$R_SZ $INPUT"
cat $KERN >> $OUTPUT
if [[ $K_PAD -lt 512 ]]; then
dd if=/dev/zero bs=1 count=$K_PAD >> $OUTPUT
if [ $K_PAD -lt 512 ]; then
dd if=/dev/zero bs=1 count=$K_PAD >> $OUTPUT
fi

cat $RD >> $OUTPUT
if [[ $R_PAD -lt 512 ]]; then
dd if=/dev/zero bs=1 count=$R_PAD >> $OUTPUT
if [ $R_PAD -lt 512 ]; then
dd if=/dev/zero bs=1 count=$R_PAD >> $OUTPUT
fi

TOTAL=`stat -c %s $OUTPUT`
echo "concatenated bootloader, kernel and initrd into ::> $OUTPUT"
echo "Note, your first partition must start after sector $(($TOTAL / 512))"
TOTAL=$(stat -c %s $OUTPUT)
printf "concatenated bootloader, kernel and initrd into ::> %s\n" "$OUTPUT"
printf "Note, your first partition must start after sector %s\n" "$((TOTAL / 512))"